Deimos: Radius 6.2 km, Mass 1.47e15kg.
Let's pick an initial circular orbit radius at a safe 8km.
Orbital velocity calculator gives 3.502m/s orbital velocity.
To deorbit, we'd need to drop periapsis to ~6km so the same calculator gives us 3.242m/s for apoapsis of 8km and periapsis of 6. (lithobraking by digging boots into the surface at 3m/s should be enough to shed the rest of the velocity.) We need to extract 26cm/s of delta-v out of our cans.
After a good bit of searching, I managed to find "For single-hole nozzle without surfactant, the droplets velocity was around 17 m/s just near the nozzle exit (area 1)" source for an insecticide spray. That's 1.73s of specific impulse - good enough.
The rocket equation calculator for 100kg of astronaut (final mass), 17m/s popellant speed, and 0.26m/s delta-v gives 101.54kg of initial mass. So, 1.54kg. Big bathroom air fresheners are 550 grams, so 3 cans will do, 4 if you want to be safe. Just fire retrograde (can nozzle directed prograde) near apoapsis.
If you wanted to land vertically, shedding 100% of orbital velocity using the aerosol sprays, 22.86kg would be enough.