Can I ask what treatment you guys ( and gals) use to re proof the hood?

I have used Renovo in the past, but notice on their website that it is suggested to clean all remnants of the previous treatment using a cleaner
And then and only then apply the Ultra Proofing liquid. Recommends doing this every 6-12 months!!

I used their chat page facility to ask some pertinent questions, but frankly it was a waste of time ( 40 mins and only 4 responses in that time) consequently
I now have no intention of buying their product.

Thanks in advance.