Bilt Hamber auto-clay is designed to remove stubbornly bonded surface contaminants and restore a perfectly smooth finish on bodywork and glass. Three different versions of Bilt Hamber auto-clay are available, none of which require the use of a dedicated clay bar lubricant; all three glide smoothly over underlying surfaces using just water alone. The regular version is very firm and has a relatively high level of abrasive strength, which makes it ideal for use in hot weather and for removing high levels of contamination. The medium version is softer and easier to shape, which makes it ideal for year-round use and for tackling moderate levels of contamination. As its name suggest, the soft version is even softer and has a relatively low level of abrasive strength, which makes it ideal for use in cold weather and for removing low levels of contamination. When used appropriately, all three versions leave treated surfaces feeling silky smooth in readiness for either polishing or the addition of protection.