You will find any heavy duty cleaner degreaser or tfr will do the job. My current favourite is made by Merlin but difficult to find online, I get it from a local cleaning supplies shop.
Better yet, good old fashioned cif cream cleaner. It cleans better then anything else IMO.
Things like ubik, virasol etc are a bit more convenient to use as you can dilute them in a backpack and spray con roofs, fascias before cleaning them with wfp. Whereas cif you need to apply directly to brush and scrub, so can take longer, but you get better results.