What is it doing? Skimmers have a break in period that usually takes around a week or two. No you do not need to clean the whole inside but only every 3 months or so is sufficient. The pump will not be dirty after a few days.
29g Mixed Reef, 150w 14k Phoenix MH w/ Moonlights, Reef Octopus BH1000 HOB Skimmer, Ecotech Vortech MP10es, ReefKeeper Lite (Plus), PH Probe, Temp Probe, ATO, Carbon/GFO Reactor.