The EnvirWash Parts Washer Concentrate is safer, easier to use and can accomplish the same job as the solvent-based parts washer. Product Comparison: EnvirWash VS Solvent-based Parts Washer Solution EnvirWash Solution - NON-Flammable - Biodegradable - Easy on Hands & Skin - No Storage or Disposal Problems   Solvent-based Solution - Extremely Flammable - Not Biodegradable - Harsh on Hands & Skin - Storage and Disposal Problems Cost Comparison: EnvirWash VS Solvent-based Parts Washer Solution EnvirWash Solution - 1:11 Mixing Ratio= Mixed solution cost under $3.00 per gallon - No Storage or Disposal Costs Solvent-based Solution - Average cost per gallon=$3.00 - Plus Disposal/collecting costs