When the dirty water just won’t drain out of your sink, you need to do something about it. But what? Commercial drain cleaners can be quite effective, but it all depends on why your plughole is blocked. Make sure that you buy the right cleaner for the job and you should find that it sorts the problem. If you don’t want to splash out on expensive drain cleaners, try using a plunger. Then carefully pour some recently boiled water down the drain (be careful!) and you might find that sorts the problem. If nothing works, it’s time to get a plumber out. They can identify the problem quickly and get your drains flowing again in no time.