More or less, yes. Then you leave it (ideally overnight) so make sure everyone has done what they need to do and the washing up is up to date.Just found some Dambuster at my local Wolseley , £32.00 a liter , think its just sulphuric acid , still much cheaper than a rodding co if it works , what do you do , just chuck the lot down the pan ?
Top tip for all: Buy a BFO gallon/5 litre jug of white vinegar and bung a cup full down every plug hole and toilet about every 3 to 4 weeks at bedtime. The vinegar is a natural acid and will eat through most mild crap that builds up helping prevent future problems. The vinegar also acts as a de-scaler so if you have a limescale build up you can use it on that too. I soak a folded piece of paper kitchen towel with the stuff and then wrap the towel around the scaled object, pour a bit more on for good measure, leave for a good while and then either wipe off, or use