How can I use CLEAN F9 A and CLEAN F9 B?

To remove the majority of incrustations in the fume side of heat exchanger you should:

• Spray CLEAN F9 A
• Let the product react from 10 – 20 minutes.
• Brush and thoroughly rinse the whole surface with mains water
• Spray CLEAN F9 B
• Let the product react from 5 – 15 minutes.
• Brush and thoroughly rinse the whole surface with mains water
• If there are still some persistent deposits, make the burner work for 1 – 2 hours and check the results

To guarantee the best protection, we suggest to make this cleaning operation each year.