These are the three cleaning solutions available for use depending on the job. Under normal conditions BLC and Penetrate is used. For very  dirty lines DAC may be used.

B*L*C  Beer Line Cleaner /Alkaline Cleaner

Chemical Name is Potassium Hydroxide / Clear & Odorless
Incompatible with Acids, Soft Metals (Aluminum, zinc)
Effects and Hazards of the Eye, Skin, Inhalation & Ingestion if contact is made.

PENETRATE Beer Line Cleaner / High Alkaline Cleaner

Chemical Name is Potassium Hydroxide / Clear & Odorless
Incompatible with Acids, Soft Metals (Aluminum, zinc)
Effects and Hazards of the Eye, Skin, Inhalation & Ingestion if contact is made.

 
D*A*C  Beer Line Cleaner / Highly Alkaline Cleaner

Chemical Names are Potassium Hydroxide & Sodium Hydroxide / Clear & Odorless
Incompatible with Acids, Soft Metals (Aluminum, zinc)
Effects and Hazards of the Eye, Skin, Inhalation & Ingestion if contact is made.