I assume you mean Holloway House Quick Shine and Floor Finsih. I know that Holloway makes a product to remove the build up, so it's obviously a known problem. I read on another forum that when Holloway was called about the problem, they recommend using a wax remover from your local hardware store. Stress to your sister that, in the future, she should stick to manufacturer recommended cleaning products beacause so many other products out there can leave a residue that will build up over time. It often looks great the first couple of times, but after several uses, the beauty of your hardwood can be diminished.