Windjammer or something custom made to keep the hatch from getting filthy?

[SlowD]

Anyone with a windjammer or something that is custom made to keep some of the dirt from building up so fast on the hatch? Anything that actually works?
Must get pretty violent back there at higher speeds because dirt is trying its hardest to imbed itself into my vinyl, I am washing and detailing it every few days at this point.

Thanks!