First of all flush the system with cold water to prevent evaporation rates and polymerization then the most economical method of using RXSOL-G 50 Marine is by direct injection followed by recirculation washing, using tank cleaning machines. Spraying Method  - Using RXSOL-G 50 Marine as delivered in drums. Make the solution 0.5 to 5% concentration and  spray onto areas where residue remains following rough washing leave for 10-45 minutes (but do not allow to dry), then butterworth at maximum pressure and warm water 60oC for at least 3 hours, checking that there is no foam remaining in the final stages.  Inspects tanks and if desired result has been achieved fresh water rinse and dry.