You need to check how your dog is getting infected again. He may get in touch with an infected dog or may be you allow your dog to stay very long in grassy ground. If you wish to use RIDD, the golden rule is :
Give your dog bath with a good shampoo, allowing him to dry up all day and then use RIDD the next day. If you use shampoo and RIDD together, it won't show it's best result.
Use Bayer's Anti Tick collar. Let the collar be on his neck all time. But make sure you remove it at the time of bathing or when the animal is sick.