Fenwicks fs 1 bike cleaner concentratefs 1 concentrate is a unique complex blend of biodegradable liquid raw materials that leaves surfaces exceptionally clean and uncontaminated no other cleaner comes close to its ability to clean safely engineered at a nano molecular level fs 1 contains no solid particles of any size that would otherwise drop out or be left behind after cleaning and rinsing features free from caustics acids solvents metasilicates abrasives or silicone safe to use on s