Like all other steel or aluminum cans, empty aerosol cans are recyclable, which could give you added incentive to finish up that can of whipped cream! Can you recycle these curbside? Check your local recycling guidelines- in my county they go to scrap metal recycling.
bug spray & sunscreen
degreasers (like WD40)
What happens to these cans in their next life? Picture a world of recycled bike and car parts, rebar and steel beams, appliances, and- yep- new cans (some of which are already 25% recycled metal).