I doubt very much if she has formally set herself up as a company, she is probably just put herself up as a cleaner using either word of mouth or using social media. She probably doesn't even have a DBS check or if she does it one she had while working in the care home. You say you have heard she is doing private cleaning did you mention to that person that she done some cleaning for you and you were not very happy with the service she provided and you would not recommend her. No need to elaborate but word of mouth with non recommendation goes a long way.
Why Are Blokes Obsessed With Noisy Gadgets??
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Washing bio gel or quid in the drum