Small Flame, or Gas Not Flow on LPG Gas Stove

Some customer ask me about their gas stove. Why one of my 2 burner gas stove can't turn on? Another ask, why the flame is too small even the knop already on max level. The answer maybe on the regulator they use. The pipe or hose probably dirty, but gas always able to escape. But the regulator is a part that control the pressure of the propane tank. If that part malfuction, then the flow of propane also got trouble. Most the couse is regulator that got oil and dirt. Just drop few water with liq detergent on the outer flow of the regulator, and it will fixed it.Normal gas regulator has small part like marbles to quit leaking gas. If it dirty, the gas won't flow normally, sometime never flow at all, so once again. water with liquid detergent able to fix it.