Three signs that tell us it's time to replace your car's windshield wipers:
1) They left behind a winning streak
2) Creaking during use
3) They don't stick to the windshield 100% - for example, it's harder for the wipers to press sideways on the windshield than in the middle
The decorate and protection function were merged into our tips, maybe the protection function confused you, why, the reason is, it can shine the driver'eyes behind you to stave off rear-end.