I use soap, so have no trouble using it.I've never heard of collecting soaps but I kind of want to do it now! I have a mini collection of unbranded soaps that I pick up on craft stalls at shows because they smell lovely but then it seems a shame to use them so they're just sadly stashed away in the storage cupboard, out of sight, out of mind. Maybe I should collect them up and put them somewhere where their smell will be put to good use. I'm loving the soaps on a mini bookshelf, that's fab!
I know someone who makes their own using goat milk. It lasts so much longer than shower gel and no plastic.