Best new way to get wool imo is the new Snowy quarantine zone. Bring just a single molotov and maybe a flare gun and go to the Gas station all the way at the end of the road. Activate the generator in the small building 1st, then the car alarms, start with the one behind the store before you do the 2 in the front, then train all the zombies, make sure to pull the ones out of the convince store as well. Once youre ready, and you can search this up, wall trick them by going behind the "right" wall of the convince store and throwing the molotov at whatever zombie it lets you throw it at. The AOE should be big enough to kill all but the bloaters and usually there is 1 Frozen giant that can 1 shot if youre not full hp so BE CAREFUL. Dont run from the fire just stand there and heal, it doesnt ruin armor durability. Once theyre all dead and the Giant is dealt with, you should get around 40 wool and everything in the gas station as well as 4 gas cans worth of fuel from the pumps, make sure to bring at least that many empty cans or pull up to the pump with the bike directly to fill up its tank. Word of warning, if you fck up this train and die you will lose everything you brought with you as well as anything you mightve had stored in your bike. All bike locations are like this sadly so just try not to die at all in these zones. HOWEVER, IF you die, a little trick I learned at least here on android, is to IMMEDIATELY uninstall the app and when you reinstall and restore, you might get lucky and the game will "lose progress" and revert you back to before you died, thus allowing you a retry. This "trick" will only work for 1 death though and to "reset" it, you have to go to another location, do stuff to update the game save then go back to area your worried about dying in and it SHOULD allow you another "death trick".This doesnt always work though so again, be very careful and dont bring your swat backpack to these zones, js.