Regardless of your reason for wanting to eliminate mildew in your washing machine, it’s important to understand why it’s there in the first place. Mildew thrives in damp conditions and needs something to feed off: soap suds, hair, lint and dirt all fit the bill. Sound familiar? Your washing machine is the perfect breeding ground.
I have had a lot of clients call that was concerned about mold in washing machines. I could see how it could possibly happen, but I have always found the mold elsewhere, such as on building materials, which caused the high spore count. Also I have found that most commercial laundry rooms do not have enough venting.
My guess would be the mold is somewhere else other than the washer,if you are getting such high spore counts. There was obviously a mold issue and remediation work for you to be doing a clearance test. Where was the initial mold that required remediation? Could there be hidden mold somewhere else in the room?
When you clearance test a job for somebody, you should get a copy of the remediation protocol or at least a guidance letter from an Indoor Environmental Professional, as required by the IICRC S520, Second Edition. Unless the mold was less than 10 square feet, even though a recent study showed the 10 feet rule is incorrect and should be done away with.](*,)