The ITG CLK-2 cleaning and maintenance kit is an essential part of owning and running an ITG panel filter or air filter.
You will need to periodically clean your filter and re-protect it with dust retention spray.
All ProFilters are pre-treated with the Heavy-Duty Dust Retention Spray at the factory so this is probably the kit you need rather than the CLK-1 light-duty version.
Consists of 1 x CL-1 (500ml) cleaning fluid, and 1 x JDR-2 (400ml) Heavy Duty Dust Retention spray.