All the usual…wash you bike at your own peril tribe out at the moment I see?!? What a load of rubbish, I have had a mini for the last two years, never missed a beat. But I secure it in the boot when full of water and as a result have never lost a drop. As for cleaning your bike with it, it’s not a pressure washer at best it’s a strong hose. I use mine to get rid of the heavy mud especially on tyres and crevices around the bike as, being blunt, I also don’t want to drag the shot through my car. The mini is nothing like powerful enough to cause any more significant damage than a standard hose pipe. It’s the shitty mucoff and other cleaning agents that cause bigger problems. For reference I ride 3-4 days a week in FOD all year around. I use a mobi and I have single handily managed to make a RF pFBB last longer than anyone else in my riding group, that’s serial bike cleaners and religious ‘I never clean my bike’ folk alike.
Other good thing about the mini is I can blast most of the crap off my clothes at trail side which helps preserve the washing machine.
OP I think your warranty is from date of purchase not the subsequent replacements. But as others have said you could always tread down the EU 2 year law, see how you get on