it can be cause by water leakage maybe.. or if that thing is wood maybe anai-anai~ last time i got dry water mark in my room and the cause is my water tank on and off pipe leaking and the cost is rm6..

This post has been edited by firdaus_bob: May 4 2009, 12:20 AM

if permenantly u can ask the guy to check ur pipe if got leakage the cost is around rm50-300 and that depends on what stuff the repair man use = permenantly solve the problems and where do u live? if nearby i can recommend one of best fellow on low cost
last time i ask him to spray anai-anai poison on my rooftop only cost me rm100(poison rm30, tank rm20, rm50 upah panjat bumbung) huhuhu