04589925 is referenced by 39 patents and cites 15 patents.

Acid-reactive organic and inorganic matter, such as stains and/or deposits, is removed from substrates by contacting such matter with a composition containing urea and sulfuric acid in which the urea/sulfuric acid molar ratio is less than 2. The urea-sulfuric acid compositions may optionally contain other components such as water, surfactants, and/or non-aqueous polar solvents which accentuate the activity of the compositions toward hydrophobic materials. The water-containing compositions which have H.sub.2 O/(urea+H.sub.2 SO.sub.4) molar ratios below about 2.5 are particularly useful for removing hydrolyzable matter by partial or complete hydroylsis.

Title
Methods for cleaning materials
Application Number
318629
Publication Number
4589925
Application Date
December 7, 1984
Publication Date
May 20, 1986
Inventor
Donald C Young
Fullerton
CA, US
Agent
Michael H Laird
Gregory Wirzbicki
Dean Sandford
Assignee
Union Oil Company of California
CA, US
IPC
B08B 9/00
C23G 1/02
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