I have a great method of cleaning white pvc doors. On the first clean I attack them with the pink stuff on a sponge scouring pad. After the frame, ingo and door is done I clean with the wfp. Only then can I see where the stubborn stains are and then I get to work with the pink stuff on a pad and give another good clean with wfp. Takes me at least 10mins but I have found it pays dividends with the female house residents. Only works with white pvc doors and no use with brown pvc doors.
I haven't lost a customer yet who has a white pvc door and they discuss it with their friends and I tend to get a new customer every week now.
Good if anyone is starting up and will have the time to bring them up like new because its the first thing the customer notices when opening the door. 😉