If you are unsure as to the nature of your stain or you get both water and lubricant stains, vdust plus will fit the bill perfectly. Designed to clean away water and most oil stains, vdust plus eliminates streaking and provides a moderate static barrier. Its anti friction ability provides a safer and smoother cleaning process reducing potential risk to the sensor. Most alcoholic formulas such as methanol are designed to remove oil from optical surfaces. However, they are unable to remove or dissolve protein contamination. At the same time they contribute to surface friction and static build up. It is known that during the cleaning process water molecules act as lubricant on the sensor reducing the friction and static built up. Therefore, it is highly recommended to use vdust plus ™ for its cleaning power and sensor protection.