In a cleaning method for removing adhesive residues from surfaces, in particular after separating an adhesive connection between adhesively joined partners, liquid carbon dioxide from a reservoir enters a jet apparatus and is guided there through a first dosing unit into an expansion chamber, wherein a cold-resistant liquid is then supplied to a mixture created in the expansion chamber from gaseous carbon dioxide and carbon dioxide particles and wherein the mixture, to which the cold-resistant liquid has been added, exits the jet apparatus via an outlet opening thereof. Furthermore, a jet apparatus removes adhesive residues from surfaces.

A vehicle body upper structure includes: roof side rails provided at end portions in a vehicle width direction of a vehicle body upper portion; side outer panels covering vehicle outer side surfaces of the roof side rails; and a roof panel made of a material different from a martial of the roof side rails and provided at a center portion in the vehicle width direction of the vehicle body upper portion, and the roof panel and the paired side outer panels are fixed to one another by braze joining. Outer end portions in the vehicle width direction of the side outer panels are joined to outer end portions in the vehicle width direction of the roof side rails. Inner end portions in the vehicle width direction of the side outer panels are not joined to inner end portions in the vehicle width direction of the roof side rails.