Tap neet got me motivated, replaced the washer in the stopcock for the toilet in the second bathroom, had to use a lot of force to unscrew it and also tried to replace the washer on the sink tap but it wouldn't budge, so instead of forceing it and risk cracking it I used a shifter to simply turn it off even tighter so no more leaks in there. In the main bathroom replaced the cold water sink washer and when I pulled the old one out the actual rubber of the washer was gone, no sign of it no idea where it went but at least now I can use the cold water tap again.