Toyota HILUX Owner's Manual Supplement page 23

21
1-7. Roller cover and resin sports bar
Cleaning the canister
The canister stores the roller cover when opened.
The canister has two inspection points for cleaning any leaves and debris
collected inside the canister.
With the roller cover open, unscrew the inspection cover to gain access
to the canister.
Remove all larger debris by hand and use a brush or hose with water to
remove any small particles.
Ensure water flows freely from all four drain tubes.