The Single Edge (whether Alloy or Steel) is made out of 100% metal and super easy to clean. You want to start by leaving your razor under running warm water to wash off hairs and any residue after each shave. Ensure you shake out any excess water from the razor in between uses.
Moreover, if you're looking for a deeper clean, a quick dip in rubbing alcohol will also remove any water build-up you may not be able to see. After the razor is dry, you may use a gentle household stainless steel cleaner to polish and buff the razor.