Zep Acidic Toilet Bowl Cleaner - it is pretty easy to use. You squeeze and twist the cap which opens it and then you just squirt it around the toilet. I expected the smell to be strong but it was actually not bad at all and has a clean fresh scent. I let it sit and swished it around with the toilet brush. They say you only have to leave it for 5 minutes but I let it sit for longer hoping it would work better.

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