| TYPE |
DESCRIPTION
OR
IDENTIFICATION |
CAUSE OF PROBLEM |
REMOVAL |
PREVENTION |
| Protein |
Blue rainbow hue varnish-like "applesauce" |
1. Using nonchlorinated cleaner
2. Inadequate prerinse
3. Water temperature too low
4. Not enough cleaner |
Double recommended amount of detergent and add same amount
of sodium hypochlorite as detergent in 160oF water
for 10 minutes. |
1. Use a chlorinated alkaline detergent
2. Clean equipment after each use
3. Adequate prerinse |
| Milkstone |
White to Yellow/gray |
1. Minerals from milk
2. Minerals from water |
Acid-wash using 1 ounce acid per gallon 150oF
water for 10-20 minutes. |
Acid-rinse each time equipment is cleaned w/1 oz. acid per
5 gallons cool water. |
| Fat/Grease |
Hanging water droplets.Greasy |
1. Same as protein
2. Low water temperature
3. Not enough detergent used
4. Prerinse water temperature too low |
Double recommended amount of alkaline cleaner and add same
amount of sodium hypochlorite as detergent in 160oF
water for 10 minutes. |
Regular & proper cleaning procedures w/acidified rinse
each time equipment is used. |
| Mineral |
White (water stone)Chalky gray |
1. Improper rinsing
2. Failure to use acidified rinse |
Acid-wash w/4 oz acid cleaner per gallon 150oF
water. Wash 10-20 minutes. |
Acid-rinse each time equipment is cleaned with 1 oz. acid
per 5 gallons cool water |
| Iron |
Red to brownish black |
1. Water supply
2. Steam supply |
Wash w/4oz. acid per gallon of 105oF water for
10-20 minutes. |
1. Acid-rinse each time equipment is used w/1oz. acid per
5 gallons of cool water
2. Water treatment
3. Sanitized w/and acid sanitizer |
| Silica |
White to gray glazed appearance |
1. Use of mechanical cleaners for manual cleaning
2. Poor rinsing
3. Using too much cleaner
4. Failure to manually clean outside surface of equipment |
Normally a fluorinated acid is necessary to remove silica
films. These acids may etch class surfaces if not used properly. |
1. Rinse thoroughly with cool water after washing.
2. Acid rinse each time equipment is washed w/1oz. acid per
5 gallons water.
3. Manually clean outside surfaces of equipment, clean inside
mechanically. |
| Inking (blackening) |
Black in rubber parts |
1. Inadequate final rinse
2. Reaction between chlorine or chlorinated compound and rubber
3. Final rinse not acidified |
Acid-wash w/1oz. Acid per gallon of 150oF water
for 10-20 minutes. If not removed, it may be necessary to replace. |
1. Acid rinse each time equipment is washed with 1 oz. acid
per 5 gallons water.
2. Proper dry storage |
Manufacturing
or
Maintenance Oil |
Grease, factory dirt |
1. Improper initial cleanup.
2. Poor maintenance |
Double recommended amount of detergent and add same amount
of Sodium Hypochlorite as detergent in 160oF water
for 10 minutes.Follow with strong acid, 2oz. per gallon wash. |
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