Reducing patterns is usually done by selective breeding for reduced patterns. In other words if you have a mojave for example, breed it to another reduced pattern animal(normal, pastel ect) will usually(not always) produce some reduced pattern babies. Then breeding offsping back to parents to help reduce the pattern even further. It will take a few generations to refine and reduce the pattern but that is what most breeders do. Brian Gundy has done this with great success for his gold blush mojave line. Hope this helps