"Do you recommend a certain brand or type detergent?"
Do not use any jells or tablets, these will just make a mess and clog up everything....use Electrol powder and keep it fresh....do not buy those tubs of stuff at the box stores, it will go bad before it can be used up. Also be sure to run the water at the sink before starting the dishwasher to be sure the water is hot going in from the first or you will have real problems with cleaning also...and needs to be at least 120 degrees going in....