Rislone DEF Crystal Clean Diesel DEF & SCR Emission Cleaner — 6-Pack, Concentrated Deposit Remover

Rislone DEF Crystal Clean is a diesel exhaust fluid (DEF) system cleaner formulated to dissolve white urea-based crystal deposits and help restore proper SCR emissions system operation.

Designed for DEF/AdBlue systems, this concentrated formula targets the crystallization that can form in tanks, pumps, heaters, lines, mixers, reactors and senders—areas where dried urea deposits reduce flow and impair selective catalytic reduction performance. Sold in a convenient six-pack, each bottle is intended to be added directly to the DEF reservoir, not the diesel fuel tank, and is compatible with all approved Diesel Exhaust Fluids.

How does this product clear DEF crystallization and where does it work?

Rislone DEF Crystal Clean uses a blend of DEF-compatible cleaners and surfactants to liquefy and disperse solid urea deposits so they can be flushed or diluted by the DEF in the system. It is formulated to reach components throughout the SCR system, helping to recover restricted flow and sensor function without disassembling parts.

• Dissolves deposits in DEF tanks and filler necks that impede filling and flow.
• Breaks up crystallization in pumps, heaters and sender assemblies.
• Clears lines, mixers and decomposition tubes that cause blockages and reduced performance.
• Safe for systems with DOC, DPF, ASC and other aftertreatment components when used as directed.

What are the recommended dosages and how should I add it to my vehicle?

Dosage varies by DEF tank size: use a full bottle for most light trucks and mid-to-large SUVs, half a bottle for small cars and compact SUVs, and two bottles for many medium or heavy-duty trucks. Pour the cleaner into the DEF tank (usually marked with a blue cap) when the tank is mostly full, then top up with DEF; do not add this product to the diesel fuel tank.

• Car / small SUV (3–5 gal DEF tank): about 1/2 bottle.
• Light truck / mid-large SUV (5–9 gal): 1 full bottle.
• Medium/heavy truck (10–20 gal): 2 bottles.
• If fault light persists after ~250 miles, a second application or mechanical inspection may be needed.

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

Rislone designed DEF Crystal Clean to be compatible with OEM DEF specifications and common urea-based fluids like AdBlue, AUS 32 and other approved formulations. The product is intended for use in aftertreatment systems and should not void a vehicle warranty when used according to manufacturer guidance; always follow the vehicle maker’s service instructions.

• Works with AdBlue, AUS 32, ARLA 32 and most DEF brands.
• Engine and SCR manufacturers’ directions still apply—do not bypass recommended service.
• Use the proper filling adapter or funnel for vehicles with special DEF ports.

Who is this for? Rislone DEF Crystal Clean is aimed at diesel vehicle owners and fleet managers who experience reduced SCR performance, repeated DEF crystallization, or DTCs associated with SCR components—especially vehicles that run at low loads, idle frequently, or operate on short routes where DEF can concentrate and form deposits. The 6-pack is convenient for service shops, fleet maintenance programs, or owners of multiple diesel vehicles who want to treat systems on a scheduled basis. Always add the cleaner only to the DEF/AdBlue tank, follow the dosing guide for your tank size, and seek mechanical service if warning lights or drivability issues persist after treatment.

Ingredients

Cleaning agents and surfactant detergents