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 *"Nazi, 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 attacked the problem with cheap repair suggestions, they are awesome! They do fall under *long-lasting* and *price-worthy* -categories -- and they do qualify to be *stingy*. You are still free to suggest products but be sure to explain why they qualify for the themes. More tips like that?

  [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