Place it at the exact reveal of the mess, then follow it with a short reaction sound for the person discovering it, and finish with a clean-up sound once the spray has done its work in the edit.
About this sound
This 10-second clip is a household spray advertisement pushed into harsh clipping and distortion, with its bright promotional audio breaking apart as it plays. The result feels jarring, chaotic and oddly funny, like a familiar product pitch collapsing into noise. It comes from a SC Johnson Kabikiller television commercial in Japan for the new Rakuraku Rensha Jet, originally a 15-second TV spot.