Fenwicks fs1 bike cleaner concentrate a convenient concentrate to make upto 11 litres of fenwicks fs10 bike cleaner fenwicks fs1 bike cleaner concentrate is safe to use all over your bike including frames wheels and transmissions and also on shock units disc brakes aluminium steel carbon fibre composites plastics decals rubber and leather free from caustics acids solvents metasillicates abrasives and silicon environmentally friendly and biodegradable can be used as a concentrated