Small stains or an occasional drop of fluid under your vehicle may not mean much, but wet spots deserve attention. If puddles appear bring the vehicle in for a check immediately.
You can identify fluids by their colour and consistency:

• Yellowish green, pastel blue or florescent orange colours indicate an overheated engine or an antifreeze leak caused by a bad hose, water pump or leaking radiator.
• A dark brown or black oily fluid means the engine is leaking oil. A bad seal or gasket could cause the leak.
• A red oily spot indicates a transmission or power-steering fluid leak.
• A puddle of clear water usually is no problem. It may be normal condensation from your vehicle’s air conditioner.
• White fluffy powder on your battery indicates battery acid corrosion and may be the first signs of alternator problems