20 THE BOOK OF BUTTER 



or fifteen revolutions at high speed. This speed causes 

 greater agitation than low speed, and consequently the 

 washing is more thorough. The gate should be partly 

 open to permit escape of steam, for the pressure is likely 

 to blow out some of the cork packing. After washing, 

 the churn should be rinsed with boiling water. 



When washing a pasteurizer, a starter-can, or a milk- 

 heater, it is usually necessary to allow the casein that has 

 been precipitated on the sides, bottoms, and coils or drum, 

 to soak for a time in the solution. In order that the soak- 

 ing may be effective, it is necessary to prepare more solu- 

 tion than would otherwise be used. For proper soaking 

 of the casein, a combined pasteurizer and ripener should 

 be about one-fourth to one-third full of washing solution. 



The floor should be washed with a fairly strong washing 

 solution. This compound may be made in a vat and then 

 carried in pails and from them distributed on the floor. 

 There is a tendency to waste floor-washing solution. It 

 should be poured on the floor only as fast as the man or 

 m?n are able to scrub. Only lazy operators attempt to 

 clean without the application of friction with a scrubbing 

 brush. All the washing solution should never be thrown 

 on the floor before the scrubbing process is started, for 

 most of it goes down the drain and thus is wasted. It is 

 advisable to begin scrubbing at the highest point of the 

 floor, and as the solution runs toward the drain the scrub- 

 bing may be continued in that direction. 



Painted surfaces, such as the outside of the churns, vats, 

 and separators, should not be cleansed with a washing 

 solution on account of removing the paint. On painted 

 surfaces where there is only a little grease, scrubbing 

 with a soft-bristled brush and boiling water is sufficient. 

 If there is too much dirt to wash off in clear boiling 



