just moved into a nice house with a lovely walk in shower (its lush!). when I wash my hair I know I moult! I have long hair and in the old house it was a shower over bath and I always had to pick loads of hair out the plughole. The shower here has a mushroom shape shower drain cap (I think thats what its called). How do I keep that draining freely, so it doesnt get clogged up or nasty?