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AFP recommend using the below chart to calculate how regulaly you need to carry out any maintenence to your Aluminium Rainwater Systems.


Frequency of Cleaning


Urban industrial.  Moderate SO2  levels in coastal area with low salinity

12 months


Industrial areas and coastal areas with moderate salinity and SO2  levels >30 mg/m3

6 months


Industrial areas with humid and aggressive atmospheres, with SO2 .> 30mg/m3 Coastal and offshore areas less than one km from coast with high UV, high humidity and salt > 12 mg per litre rain water)

3 months


The purpose of planned maintenance is to ensure that no more than cosmetic treatment ever becomes necessary.

Polyester powder coated products needs to be cleaned and maintained regularly to ensure the decorative and protective properties are retained. The frequency of such cleaning will depend on many factors including:-

  • The geographical location of the building
  • The environment surrounding the building i.e. marine, industrial, alkaline/acid etc…
  • Levels of atmospheric pollution
  • Prevailing wins
  • Protection of the building by other buildings
  • Possibility of air borne debris (e.g. Sand) causing erosive wear of the coating

The best method for cleaning is by regular washing of all coatings, using a solution of warm water and mild detergent (e.g. 5% Teepol solution). All surfaces should be cleaned using a soft cloth or sponge, using nothing harsher the natural bristle brushes.

If atmospheric pollution has resulted in heavy soiling of the coating then nothing harsher that white spirit should be used for cleaning and in no circumstances should any abrasive cleaner or any cleaner containing ketones, ester or alcohol be used.

The frequency of cleaning depends in part on the standard of appearance that is required and also the requirement to remove deposits, which could, during prolonged contact with either the powder film or metal substrate (if exposed) cause damage.

In industrial environments the normal frequency of cleaning should be no more than three monthly intervals. However where there is high atmospheric pollution or an extremely hazardous atmosphere (i.e. combination of actors in item 2) this should be reduced to cleaning at monthly intervals.

Where the atmosphere is deemed to be non-hazardous (i.e. Rural), or where “Clean Environments” have been declared then the period between cleaning frequency can be extended to not more than eighteen months.

However if the project is subject to any unusual environment factors or is close to salt water or marine environments, A.F.P must be consulted on an individual basis.

Cleaning polyester powder coated surfaces


Usual maintenance of polyester powder coated products can be done with an appropriate cleaning product, followed by clear water rinsing and wiping using a soft cloth.

All surfaces should be cleaned using a soft cloth or sponge, using nothing harsher than natural bristle brushes. (Cleaning of window sections etc. can be conveniently carried out at the same time as glazing cleaning.)

If the project is subject to any hazardous unusual environmental factors, or is close to salt water, an estuary or marine environments then Akzo Nobel must be consulted on an individual project basis.

If the coating is very heavily soiled (i.e. due to lack of maintenance), then the recommendation is to consult a specialized company.

Cleaning products

Before cleaning the cleaning agent’s datasheet must be consulted.

Usual maintenance can be done using water with mild detergent (pH 5 to 8).

If the atmospheric pollution has resulted in heavy soiling of the coating, some stains or marks may require stronger domestic products such as products based of alcohol, petroleum spirits, white spirit, or bleach (diluted to 5%). In this case, it is necessary to rinse the coating immediately after the cleaning product has been used.

In no circumstance should any abrasive cleaner or polish, or any cleaner containing ketones or esters be used.

Disclaimer: The information given in this sheet is not intended to be exhaustive and any person using the product for any purpose other than that specifically recommended in this sheet without first obtaining written confirmation from us as to the suitability of the product for the intended purpose does so at his own risk.  Whilst we endeavour to ensure that all advice we give about the product (whether in this sheet or otherwise) is correct we have no control over either the quality or condition of the substrate or the many factors affecting the use and application of the product.  Therefore, unless we specifically agree in writing to do so, we do not accept any liability whatsoever or howsoever arising for the performance of the product or for any loss or damage (other than death or personal injury resulting from our negligence) arising out of the use of the product.  The information contained in this sheet is liable to modification from time to time in the light of experience and our policy of continuous product development.