Patent Number: 
Section: claims

1. A decreasing composition, comprising a base, a saturated or unsaturated polyethoxylated fatty alcohol, a copolymer of ethylene oxide and propylene oxide, and water, in which the base has a concentration in OHxe2x80x94 ions in a range from 0.1 to 1.5 mol.l xe2x88x921 , in which the saturated or unsaturated polyethoxylated fatty alcohol, is at a concentration in a range from about 0.01 to about 1.5% by weight, and in which the copolymer of ethylene oxide and propylene oxide has a concentration in a range from about 0.025 to about 1.5% by weight. 2. A composition according to  claim 1 , in which the fatty alcohol is selected from the group consisting of lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, arachidyl alcohol, myristyl alcohol, oleic alcohol and linoleic alcohol. claim 1 3. A composition according to  claim 1 , in which the polyethoxylated fatty alcohol is a compound of the following formula (I): claim 1 Rxe2x80x94(xe2x80x94Oxe2x80x94CH 2 xe2x80x94CH 2 ) n xe2x80x94OHxe2x80x83xe2x80x83(1)  in which R is a saturated or unsaturated alkyl group comprising from 10 to 24 atoms of carbon, and in which n represents the monomeric unit number of ethylene oxide, wherein n is fron 10 to 30. 4. A composition according to  claim 1 , in which the polyethoxylated fatty alcohol is a ether of oleic alcohol and an ethylene polyoxide with 20 monomeric units of ethylene oxide, according to the following formula (II):  claim 1 5. A composition according to  claim 1 , in which the copolymer of ethylene oxide and propylene oxide is a block copolymer. claim 1 6. A composition according to  claim 1  in which the copolymer of ethylene oxide and propylene oxide is a block copolymer of the following formula (III):  claim 1 7. A composition according to  claim 1  further comprising a foam inhibitor agent. claim 1 8. A degreasing liquid comprising a composition according to  claim 1  comprising about 0.05 to about 0.4% by weight of polethoxylated fatty alcohol, about 0.025 to about 0.6% by weight of copolymer of ethylene oxide and propylene oxide, about 0.5 to about 1 mol.l xe2x88x921  in OH xe2x88x92  ions, and further comprising a foam inhibitor agent. claim 1 9. A degreasing liquid according to  claim 8 , in which the foam inhibitor agent is a branched or unbranched alkyl phosphate, comprising 4 to 12 atoms of carbon. claim 8 10. A degreasing liquid according to  claim 8  in which the inhibitor agent is a branched alkyl phosphate, comprising from 6 to 12 carbon atoms, at a concentration of 0.1 to 0.4% by weight. claim 8 11. A degreasing foam comprising a gaseous phase and a degreasing composition according to  claim 1  which further comprises a foam destabilizing agent. claim 1 12. A degreasing foam comprising a gaseous phase, and a degreasing composition according to  claim 1 , in which said composition comprises a saturated or unsaturated polyethoxylated fatty alcohol, at a concentration in a range from about 0.4 to about 1.5% by weight, a copolymer of ethylene oxide and propylene oxide at a concentration in a range from about 0.4 to about 1.5% by weight, said composition which further comprises a foam destabilizing agent. claim 1 13. A degreasing foam according to  claim 11 , in which the foam destabilizing agent is a branched or unbranched alkyl phosphate, comprising from 4 to 12 atoms of carbon. claim 11 14. A degreasing foam according to  claim 11  in which said foam destabilizing agent is a branched alkyl phosphate comprising 6 to 10 atoms of carbon, which is at a concentration of 0.2 to 1.1% by weight in the composition, wherein the weight ratio in the composition of the concentration of the saturated or unsaturated polyethoxylated fatty alcohol to the concentration of the copolymer of ethylene oxide and propylene oxide is about 1.5. claim 11 15. A degressing gel comprising a degreasing composition according to  claim 1  and further comprising a viscosity agent. claim 1 16. A degreasing gel comprising a degreasing composition according to  claim 1 , in which the saturated or unsaturated polyethoxylated fatty alcohol has a concentration in a range from about 0.05 to about 1% by weight, the copolymer of ethylene oxide and propylene oxide has a concentration in a range from about 0.025% to about 0.4% by weight, and further comprising a viscosity agent. claim 1 17. A degreasing gel according to  claim 15  in which the viscosity agent is selected from the group consisting of xanthan gum, an aluminum oxide and silica gel. claim 15 18. A process of degreasing a surface, said process comprising putting the surface to be degreased into contact with a composition according to  claim 1 . claim 1 19. A process of degreasing a surface, said process comprising putting into contact the surface to be degreased with a liquid according to  claim 8 . claim 8 20. A process of degreasing a surface, said process comprising putting into contact the surface to be degreased with a foam according to  claim 11 . claim 11 21. A process of degreasing a surface, said process comprising putting into contact the surface to be degreased with a gel according to  claim 15 . claim 15 22. A process of radiochemical decontamination of a surface comprising the steps of degreasing of the surface by a process according to  claim 18  and subsequent radioactive decontamination of said degreased surface. claim 18 23. A process according to  claim 22 , in which the radioactive decontamination is decontamination by chemical erosion of sail surface. claim 22 24. A process according to  claim 23 , in which the chemical erosion of said surface is selected from the group consisting of cerium erosive treatment, an HF erosive treatment, or a ruthenium specific treatment. claim 23