1. Hot or Cold?
Consider hot water for greasy and oily cleaning. For general cleaning of dirt and grime, cold water will perform well.
2. Petrol or Electric?
For outdoor or heavy-duty requirements you should consider petrol. For indoor or less intensive use consider electric.
3. Pressure and Water Flow
Look for higher water flow for build-ups such as mud and thick grease. Look for pressure to remove set-in grime.