Every container must be completely dry and free of any liquid content to be considered as non-hazardous metal. In some cases, you can dry the containers with some of these methods explained here. However, for aerosol cans you might need a special tool to get that liquid out of the container. You might need AeroVent 3 Can Recycling System.
The AeroVent 3 Can Recycling System takes out residual liquids in aerosol cans, converting them from hazardous solid waste to recyclable one. When there is no liquid inside these cans, de-pressurized cans can be recycled, crushed and then called non-hazardous scrap metal. This system complies with EPA 40 CFR 261.7 and 40 CFR 261.23 regulations.
The complete AeroVent 3 Can Recycling System includes vapor absorbing carbon filter, support stand, grounding wire, and activated carbon filter. The latter can be replaced after processing about 600 cans, which can be ordered here. The can recycling system fits 2" bung of 30 or 55 gallon steel drum with the ability of holding up to 3 cans of 10" high and 2 ½"-3" diameter. There is a cobalt-tipped puncture pin that pricks the end of the can to release pressure and capture the residue inside the drum. Once the container is dry, the job is done and it can then be pressed with one of these drum/can compactors.
If you deal with aerosol cans or similar containers, do consider to have this recycling system so that your solid waste can be processed more easily and properly. It'll save cost for your disposal budget and it'll also be kinder to the environment compared to trashing hazardous wastes. Check it out!