From the Cillit Bang website
On what surfaces can I not use Cillit Bang Power Cleaner Bleach & Hygiene?
Cillit Bang Power Cleaner Bleach & Hygiene should not be used on: Clothes, textiles, carpets, wood, rubber, vinyl, painted or paper surfaces, aluminium, brass and copper. If used on metal, please immediately thoroughly wash off with water. Longer periods of contact with rust-free stainless steel, chrome, old porcelain, plastic laminate and marble can cause discolouration.
What surfaces should Cillit Bang Grease & Floor not be used on?
Glass ceramic surfaces, aluminium, copper, brass, wooden surfaces, hot and damaged surfaces.
So, don’t get it anywhere near your bikes!