Avoid spending money on fancy cleaning products instead use WD-40. You most likely already have this product sitting around your house so just grab your can spray your sink and wipe away the excess. It will remove watermarks, fingerprints, and other stains from your sink.
Is the grout around your sink stained? If so you can clean it using a bleaching pen or you can avoid this issue all together by darkening the grout with a grout colorant in a gray or dark beige color. Remember though after you color treat your grout you have to seal it to.
According to State Farm Insurance 170 million dollars a year in damage is attributed to washing machine hose failure. Make sure to check your washing machine connections and replace if they are corroded or the hoses are cracked. The typical washing machine hose only lasts about 5 years so if yours are older than that now would be a good time to replace them. You can get a set for around 20 dollars, try to get the braided stainless steel ones for they will last the longest.
Also remember you should keep a clear distance of about 4″ between your hose connections and back of washing machine, this will prevent any kinks and premature damage to the hoses. And yes this all applies to the “burst-resistant” hoses as well.