We have seen women boiling their cup multiple times per cycle, using up significant time and energy on a step that only needs to happen once. We have also seen women never sterilizing at all, which is the more common and more consequential mistake. This article gives you the correct schedule for every cleaning step across the full cup care cycle.
The Two Levels of Menstrual Cup Cleaning
Menstrual cup care operates at two distinct levels that serve different hygiene purposes and happen at different frequencies.
Sanitizing means reducing microorganisms on the cup's surface to a safe level. This is what you do during your period, between each removal and reinsertion. Soap, water, and proper rinsing achieve this level of cleaning. It is sufficient for mid-cycle use because the cup is going back into an environment (the vaginal canal) that already contains its own microbiome. You are maintaining cleanliness, not achieving sterility.
Sterilizing means eliminating microorganisms from the cup surface entirely. This is what you do before storing the cup between periods. Boiling in water achieves sterilization for medical-grade silicone cups. The goal is to eliminate whatever accumulated during the cycle so the cup is completely clean for storage and for its next use.
Understanding this distinction resolves the most common cup care question: do I need to boil my cup every time I empty it? No. Sanitizing between uses is sufficient. Sterilizing once at the end of each cycle is what matters for long-term hygiene.
The Complete Cleaning Schedule
Before your first ever use:
Sterilize the cup before using it for the first time by boiling it in water for 5 minutes. This eliminates any residue from the manufacturing and packaging process. Do this even if the cup looks clean in its packaging.
During your period (every removal):
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Wash hands with soap and water before handling the cup
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Remove and empty into the toilet
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Rinse the cup under cold water first to prevent protein from blood binding to the silicone
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Wash with mild, fragrance-free soap and warm water
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Pay specific attention to the rim, the suction holes near the rim, and the stem
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Rinse all soap residue completely
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Reinsert
You do not need to boil between uses during the cycle. Soap and water cleaning is the correct and sufficient approach for mid-cycle use.
At the end of your period (before storage):
This is when sterilization is required.
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Empty and clean the cup as above
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Place in the Collapsible Sterilizer Cup filled with enough water to fully submerge the cup
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Bring to a boil on the stovetop and boil gently for 3 to 5 minutes OR microwave on high for 2 to 3 minutes until the water reaches a full boil (do not seal the sterilizer lid fully during microwave use)
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Remove carefully, the sterilizer and water will be very hot
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Allow to cool completely before handling the cup
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Remove the cup, shake off water, and allow to air dry completely on a clean surface
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Once fully dry, store in the breathable pouch provided
Between cycles (during storage):
Nothing further is needed if the cup was sterilized and dried properly at the end of the last cycle. The cup simply remains in its breathable pouch in a cool, dry location until the next period.
Some women prefer to do a quick rinse at the start of their next period before inserting a stored cup. This is optional but harmless. Do not boil again before use if the cup was already properly sterilized.
Common Scheduling Questions
Do I need to sterilize before every period or just after?
At the end of each period, before storage, is the critical time. The purpose is to clear the accumulation from the cycle just completed before it sits in storage for 3 to 4 weeks. If you did this correctly last time, the cup should already be clean when you retrieve it for next month's use.
What if I forget to sterilize at the end of a cycle?
Sterilize at the start of the next cycle before first use. A quick boil at the beginning resolves the missed end-of-cycle step.
Can I sterilize too often?
Medical-grade silicone can withstand repeated boiling without degradation. Boiling multiple times per cycle does not damage the cup, but it is unnecessary. Over-cleaning also does not improve hygiene outcomes because the cup is reinserted into a microbiome-containing environment regardless.
What about if I am traveling or do not have access to boiling water?
Sanitizing with soap and water during the cycle is fine regardless of whether you can boil. For the end-of-cycle sterilization, the Collapsible Sterilizer Cup works in both a microwave (hostel kitchen, hotel room) and on any stovetop (gas, electric, induction). Its compact folded size makes it practical for travel.
Should I sterilize my new cup every month before using it?
Only the very first use requires a pre-use sterilization. After that, the end-of-cycle sterilization before storage is sufficient. Sterilizing at both the start and end of every cycle is technically harmless but not necessary.
Full Cleaning Calendar
|
Timing |
What to Do |
How |
|
First ever use |
Sterilize before inserting |
Boil 5 minutes |
|
During cycle, every 8 to 12 hours |
Sanitize |
Cold rinse, soap wash, full rinse |
|
End of cycle, before storage |
Sterilize |
Boil 3 to 5 minutes, air dry fully |
|
Between cycles in storage |
Nothing required |
Store in breathable pouch |
|
Start of next cycle (optional) |
Quick rinse only |
Warm water, no soap needed |
The Sterilizer Cup: Why It Matters for Correct Sterilization
Sterilizing the cup on a stovetop without a dedicated sterilizer requires holding the cup off the hot metal base with tongs or a whisk, using a separate kitchen pot, and managing a larger volume of boiling water. The Collapsible Sterilizer Cup holds the cup suspended in boiling water away from the base, uses minimal water, works in the microwave for faster sterilization, and stores flat between cycles.
For women who want correct sterilization without the inconvenience of adapting kitchen equipment, the sterilizer cup makes the end-of-cycle step something that takes 5 minutes rather than a process requiring special equipment management.
Frequently Asked Questions
How often should I sterilize my menstrual cup?
Once per cycle, at the end of your period before storage. During the cycle, sanitizing with mild soap and water after each removal is correct and sufficient.
Is it safe to not sterilize my cup during the cycle between uses?
Yes. Sanitizing with soap and water between cycle uses is the correct and recommended approach. Boiling between every use is unnecessary and does not improve hygiene.
How long should I boil my menstrual cup?
3 to 5 minutes on the stovetop or 2 to 3 minutes in the microwave until the water reaches a full boil. Both achieve effective sterilization at boiling temperature (100°C).
Can I use Milton tablets or sterilising fluid instead of boiling?
Milton tablets designed for baby products can work for cup sterilization if specifically labelled as silicone-compatible. However, boiling remains the simplest, most reliable, and most universally recommended method. Always rinse thoroughly after any sterilisation fluid use before reinserting.
At MomDaughts, we believe correct care is what makes reusable period products work for years. Confidence in every cycle.
