Most plecos and catfish will be ignored and your options are wide open.
Keep in mind that most plecos need some wood in the tank. Synodontis varieties are most commonly found in these types of tanks, but Pictus and Raphaels are viable options, as well as many less common ones. Large loaches like Clowns will often work as well.
All of these fish will help clean, but none will get enough nutrition from it so all need special attention when it comes to feeding.
Keep in mind that most plecos need some wood in the tank. Synodontis varieties are most commonly found in these types of tanks, but Pictus and Raphaels are viable options, as well as many less common ones. Large loaches like Clowns will often work as well.
All of these fish will help clean, but none will get enough nutrition from it so all need special attention when it comes to feeding.