wash between topper and rear window

[bus3]

What do you guys use to wash/clean the rear window of a truck when it has a topper on it? This has always been the hardest area to clean for me. I tried this interior window cleaner that I saw on t.v but it does not work well at all!!!!! (it has a green microfiber towel on the end of it) Thanks for any suggestions.

 

[Flash Gordon]

Proper Auto Care use to carry a slim long handle brush made just for this. Unfortunately, their out of business now

Maybe Autogeek carries them now?

 

[bus3]

Thanks. I hope they do I will look. I need to find something because this bothers me a LOT!! I need something that scrubs and something that I can apply window cleaner with to.