1000ml (33.8 fl oz) Refill - Bottle accepts sprayer from 500ml set 

P21S Gel Wheel Cleaner - for wheels that tend to soil heavily due to higher braking speeds, softer brake pads or infrequent cleaning. Spray on, allow to stand up to two hours, touch stubborn spots with a sponge and rinse off with a sharp stream of water. Gel composition clings to vertical surfaces to provide increased cleaning effect.