I usually clean my heggie house in the spring, once it has been vacated by the previous Autumn’s occupants. Once I’ve checked that it’s definitely empty, I dispose of the bedding, putting it into my garden waste bin, then I boil the kettle and rinse thoroughly with boiling water. Allow to dry in the sun, then refresh the bedding. (When I first got my hedgehog house, I was advised not to use washing-up liquid or other cleaning products.)
So pleased to hear that you have a Mum with babies. I had a Mum with six hoglets last year. I was so thrilled! Nothing has taken up residence this year as yet, which surprises me, but then it’s been an odd year weatherwise, so we’ll see.
Good luck, Lily.