It bugs me when people say £300 is "expensive" for a PROFESSIONAL machine that will help you to earn THOUSANDS of pounds.
Stop arseing about and buy one, get a tampico brush attachment and you'll wonder how the hell you ever managed without it
It only splatters if you've put too much pre-spray on.
Don't use a car polisher, way too fast and not the right attachments. Get a tool designed for the job instead.