Yeah Eric...the whole system.....don`t get 2 carried away with it....just maybe 2 teaspoonfuls of system-friendly shampoo in a sink of luke-warm water..... place it in the water hair-first, so you are looking at the base. Allow to soak for a minute or two and then dunk it in and out a few time....then rinse under running water.....gently squeeze off the excess water and then blot-dry it on a clean towel...do not rub/knead the hair.....gently brush it when nearly dry. You will have loose hairs showing through the base and indeed in the sink..this is perfectly normal....it will all settle down in a few days after a few brush-throughs..there is always loose/stray hairs in a new system and some stuck into the base ...so don`t panic.Silicone on the lace can prevent glues and tapes adhering to the lace so it`s best to give it a wash before your first bond.