| If you are pressurizing it then use soapy water (best choice). If you are just letting it idle and spraying around to find what disrupts the idle, then electrical parts cleaner works the best. 0 residue and won't harm paint, plastics, or powdercoats. If you want to find every single leak possible, then take it to a shop with a smoke machine and UV dye. Much faster when you have tons of hoses and cramped space to work in. Just my 2cents.
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