are you cleaning by hand or by wfp methods my friend?
also, a restoration service is a lot different from a clean, for example a 10 house would possibly be 110 restoring pvc, liek the opther guy said, swarfega is good, cif is also good, and you wont notice the abrasive, the best i have used is g101 (ebay) look up magica one go on youtube it the same stuff, if your wfp use it on your brush on first cleans.
after a few months in you wont want to do any kind of restoring work, windows are quicker hastle free and with a bit of g101 99% of frames will be perfect mate