what engine cleaning products do you use?

[Lez72]

Muc Off motorcycle degreaser is the best i have used and works a treat on engines. Whatever bits you spray it on though will need a good rinse off afterwards. Follow that with drying the bike off as much as you can and apply a good coating of GT85 or if you are feeling flush ACF50. Wipe off the excess and voila, a nice clean bike. At the risk of stating the obvious though, make sure you don't get any GT85 or ACF50 on your brake components  :\
If i ever get a bit carried away with the GT85 i give the brakes and discs a good clean down with good quality brake cleaner. The Muc Off brake cleaner is also excellent stuff IMO.