Hi, I’m not a plumber, but I would replace the 90 degree bend on the waste pipe from the sink with one of these https://www.screwfix.com/p/floplast-bends-92-5-white-32mm-5-pack/67525 or two of these https://www.screwfix.com/p/floplast-bends-135-white-32mm-5-pack/83056 to reduce the chances of...