Dicor Roof Sealant. Do I need to use the Part 1 Cleaner?

Hello. I need to seal my TT roof. I never used the Dicor cleaner in the past. Just Dawn detergent and water.

The "Dicor System" calls for the part 1 cleaner so the sealant will work correctly, etc..

Should I actually use this, or can I just give it a good cleaning with some detergent and water?
Thanks