Most frequently used fabrics are Top Gun and Sunbrella.
https://global.sunbrella.com/en-us/how-to-clean
Old 
In Process
Boat Covers
Sew Many Cushions and Boat Covers
Custom and Inspired Sewing
Sew Many Cushions and Boat Covers
Custom and Inspired Sewing
Most frequently used fabrics are Top Gun and Sunbrella.
https://global.sunbrella.com/en-us/how-to-clean