whats with the plastic under thingy

[kelly ann]

Hello Corolla People 

I really like my corolla, but recently its has had a prolapse (or lack of a better word...soz) ...like all the black plastic under stuff is falling down and wheel arch linings are out of the wheel arch metal bit ... I taped it up...yep that sounds safe!!!!..and took it to my local mechanic who tied it up with cable ties I think...but its coming down again...so took it to toyota deeler and they are going to charge me $1000 to replace

Can i just cut this plastic stuff off???

I so appreciate your help .....other than than my car is great...thanks everyone