An air-cooled engine is the awkward one. A GSX1400 carries most of its surface area in the fin stack, and the gaps between those fins are exactly where two decades of road film, oil mist and brake dust end up. You cannot get a cloth in there, and a brush only packs it tighter.
The usual options make it worse. Solvent runs down the fins and carries the grime with it into the head and the induction below. Pressure washing forces water between the fins and past whatever seals it finds on the way. Media blasting anywhere near an air-cooled head means picking grit out of the cooling gaps for the rest of the bike’s life.
Dry ice sublimates. It hits the surface at −78 °C, shocks the contaminant layer loose, and turns straight back into gas — so nothing is left behind in the gap it has just cleaned. Connectors get masked, extraction sits under the bike, and the only thing on the floor at the end is what came off it.
Clear road film and oil mist from between every cooling fin without packing it deeper.
Bring the cases, swingarm and caliper bodies back without polishing or abrasives.
Keep water and solvent away from the seals, connectors and brake components.
Leave a bike that stands up to a close look, not just a showroom photograph.
