Bought those cheap multicoated lens Korean or china OEM lens most of them last for years.

Less than RM200, if coating gone... Get a new 1

Check with the local smaller shops, ask them Korean multicoated lens how much to refit.

don't go for those branded shops all push you expensive lens or don't carry them

those Korean lens have catalogue, so u can check before you buy. Dont be pressured to purchase, can always leave.