My bought-as-2nd-hand bikes have plastic fender-attachements which tend to break. When they break, the fender starts to make a lot of annoying high-pitched sound. So which fenders do you recommend to replace the plastic junk? 

Please, do not interpret me wrong, the fenders can be plastic but the attachment-things must be designed the right way. I like the design by SKS in their [Bluemells Matt fenders][1] but not wanting to pay extra for the aluminum and branding, have used many plastic-mixture with proper attachments and they have never failed me (now not having the bikes at the hand). Not sure but perhaps price-worthy [product, Sunny Wheels,][2] but unknown brand -- cannot get it though. So which fenders are long-lasting price-worthy? 28" 
wheels.

**[Update]** 

This question has strayed off-topic due to changes by different users and partly due to my ignorance, sorry about that. The main point is not *product recommendations*. I am looking for **timeless/intrinsic tips to find/maintain/control/(or buy if you can justify properly) fenders**. Before you say *"XYZ, you are changing question."*, no I am not:
the *junk* description is not necessarily junk, it is in the eye of the beholder. Users such as Moz, Benson and the Velo advanced the problem with cheap repair suggestions, they are *long-lasting* and *price-worthy*. It is very hard for me to evaluate other answers.

  [1]:  http://www.sks-germany.com/?l=en&a=product&r=News%202011&i=6297801122&BLUEMELS%20MATT&PHPSESSID=d6bfd78fdebf17a0db4d71bc13d98866
  [2]: https://www.budgetsport.fi/kuvat/isot/56328833.jpg