Let me teach you the basics of editing a bus.
Start from colours. Let's say you want to remove the rego or
mercedes logo. Juz use the colour detector(above pencil) at paint
to copy the colour and draw a rectangle over it. What you did was
totally wrong, choosing another colour that does not suit it and
colour over it. That's so obvious.
Let me teach you some basics of searching clues.
If you have myopia, wearing spectacles, take them off.
Try to search the easy ones first, then follow on to the
difficults.
If very hard then you still cannot find, then copy pic and zoom
in a little bit.