One way to get a "heated tank" is to purchase one of the magnetic oil pan heaters.....provided your tank is metallic.
Attach the magnetic heater to the side/bottom of the tank (outside of course) and plug it in.....pretty soon you have heated solvent.
Installing a drain valve of some type right from the get go is a great step in making all other fluid changes, cleaning, draining better because the plug is just a mess waiting to happen.
I have installed a ball valve along with some AN fittings so I can attach various things to the drain of the tank.
A regular hose, made from scrap braided line and old AN fittings, to run when simply draining the tank.
That same regular hose also attaches to an oil filter adaptor so I can filter the drained fluid if I choose and reuse it...I use standard FL1A filters.
One of my favorite water based cleaning fluids is standard Dawn dish soap.
If will get a bit foamy if not careful, but it really doea a great job cleaining grease from parts, it has not bad odor or fumes, and is relatively easy to dispose of at the recycler.
One caveot when using Dawn dish soap....it will begin to mold over time after being contaminated with dirty gunk..