If a setup like 52's eludes you and you have a home owner special hook it up to your hot water heater and run straight hot at it. (you might even turn up the temp if its on an economy setting) That will knock off a lions share even if its a bit slower. Then hit it with a mix of orig. Dawn and some green or purple power in a high test mix. let that set then hit it again with the PW.
I've lifted paint with a small one so care is still required.
