Rislone DEF Crystal Clean Diesel DEF & SCR Emission Cleaner — 6-Pack, dissolves urea crystals for restored SCR flow

Rislone DEF Crystal Clean is a concentrated cleaner formulated to dissolve white urea crystals and restore proper flow and operation throughout SCR/DEF systems.

Designed for modern diesel vehicles using DEF/AdBlue, this product targets crystallized deposits that can form in tanks, pumps, heaters, lines, injectors, mixers and reactors. By breaking down and flushing those deposits, the formula helps recover normal SCR performance and can reduce issues like restricted DEF flow or reduced engine responsiveness when the emissions system is impaired. It is sold as a 6-pack of single-use bottles and is intended for addition only to the DEF/AdBlue reservoir—never the diesel fuel tank.

How does it clean stubborn white deposits in the SCR system?

The Rislone formula contains surfactant detergents and urea-compatible cleaning agents that dissolve crystallized residues without harming DEF components. It works throughout the supply path, from tank to injector, loosening buildup so normal fluid flow and dosing can resume.

• Dissolves urea-based white crystals in tanks and lines
• Safe for pumps, heaters, sensors and reactors
• Formulated to be DEF/AdBlue compatible and non-reactive with approved fluids

How do I use one bottle correctly for my vehicle?

Install Rislone DEF Crystal Clean directly into the DEF/AdBlue tank, which usually has a blue cap. Recommendations vary by tank size: small vehicles need about half a bottle, light trucks require a full bottle, and larger trucks may need two bottles—always top up with DEF after adding the cleaner.

• Car or small SUV (3–5 gal DEF tank): about 1/2 bottle
• Light truck / mid-size to large SUV (5–9 gal tank): use one full bottle
• Medium/heavy-duty trucks (10–20 gal tank): use two bottles

Will using it affect my vehicle warranty or DEF fluid compatibility?

Rislone DEF Crystal Clean is designed to be compatible with all approved diesel exhaust fluids and to avoid voiding factory warranties when used as directed. It is intended for systems equipped with DOC, DPF, SCR and related ammonia slip catalysts.

• Works with AdBlue, AUS 32, BlueTEC, and other approved DEF types
• Safe for vehicles with DOC, DPF, ASC, and SCR systems
• Follow instructions to avoid introducing cleaner into the diesel fuel tank

How soon will I notice improved performance and when should I reapply?

Improvement can appear after driving some miles while the system circulates and dilutes deposits, but results vary depending on deposit severity. If the DEF warning remains after roughly 250 miles or several days, a second application or professional inspection may be needed.

• Allow up to 250 miles or a few days of normal driving to assess effect
• Repeat application only if deposits persist or warning lights stay on
• Seek mechanical service when warnings continue after two treatments

Who is this for: Rislone DEF Crystal Clean is intended for diesel vehicle owners and fleet managers whose SCR systems show signs of crystallization or restricted DEF flow—especially vehicles frequently used at low loads, short trips, or idle-heavy routes. It suits passenger cars, SUVs, light trucks and medium to heavy-duty diesel trucks, and is a practical maintenance step for preventing recurring deposit buildup when used at recommended intervals.

Ingredients

Cleaning agents and surfactant detergents