Coastal:

Re: Use of "Brake cleaner". Spray can brake cleaners are intended for use on metallic parts. They contain hydrocarbon based solvents which are not compatible with the rubber parts in the brake system. If you strip the system of all old rubber parts, and then flush the steel lines with cleaner, followed by air, there will be no hazard. The solvents evaporate quite quickly, so there should be no residual. When the system is reassembled and bled, it will be clean.