303 Products 30520 Convertible Top Cleaning and Care Kit with Cleaner and Fabric Guard, 32 fl o Review (2026)

What's included

This 32 fl oz kit pairs two products from 303: the Tonneau and Convertible Top Cleaner, and 303 Fabric Guard, both sized for a full-size top rather than a small trial bottle. The cleaner is meant to lift dirt, stains and environmental buildup from the fabric surface first, and the Fabric Guard is applied afterward to restore water and oil repellency once the top is clean and dry. Selling them together as a kit means owners do not have to figure out separately which specific cleaner and which protectant are actually compatible for a fabric top material, since 303 has already paired the two steps into one purchase.

How the two step system works

According to the manufacturer, the Convertible Top Cleaner uses a colloidal action to lift and suspend oil, grease and dirt from the fabric weave, and does not contain soap, detergents, toxic organics, phosphates or caustics, which matters on fabric since harsher cleaners can strip factory water repellency along with the dirt they remove from the surface. Once the top is clean and dry, the Fabric Guard step re-applies that water and oil repellent barrier, which is what actually makes rain bead up and roll off rather than soak into the fabric and eventually lead to staining or mildew underneath the surface.

Fabric vs vinyl tops

This kit is formulated specifically for fabric convertible tops and other outdoor fabric, not vinyl tops on other convertibles. Owners with a vinyl top need a different 303 kit built around a vinyl-specific cleaner and protectant, since vinyl and cloth tops respond differently to cleaning chemistry and repellent coatings and one formula is not simply interchangeable with the other material. Buying the wrong version means spending money on a product that will not perform as intended on your top material, so checking which exact material your convertible top uses before ordering is a worthwhile step that only takes a minute to confirm.

Why detailers trust 303

303 states this cleaner and protectant combination is recommended by Sunbrella, a major fabric top and awning material manufacturer, which lends some outside credibility to the claim that it is safe and effective on that kind of woven fabric rather than just a marketing claim from 303 itself with no outside backing. That kind of manufacturer endorsement matters for a product going on a fairly expensive part of the car, since a cleaner that is too harsh could shorten the life of the fabric top itself rather than protect it, and replacing a whole top is far costlier than a bottle of cleaner and protectant ever would be.

Value and who it's for

For someone with a fabric convertible top, buying the cleaner and protectant together in one kit is more convenient than sourcing two separate 303 products and simplifies restocking later once the first bottles run low after a season of use. The 32 fl oz size means larger tops or repeat treatments are covered without running out quickly after just one or two applications. The main caveat, matching this site's own listed con, is that Fabric Guard needs careful masking to keep it off paint and glass during application, so this is not a spray-and-forget product around the rest of the car.

Frequently asked questions