Any ideas on gum removal??large large area heavily gummed.. entrance way to a cinema so loads of old and new globs..I’ve used freeze spray on a small job , but this is to big...i just don’t seem to get full removal from past jobs..I’m running a big Honda 360 with 21 lt pm from an inter pump ,so power is not the issue...I have never run a hot box ,is this the way??chemical??Its a plum job but has to be done perfectly!!!!!any advice