Methods and compositions for removing metal oxides

1. A method for removing a metal oxide soil from a surface of processing equipment in the dairy, food and beverage, pharmaceutical, or cosmetic industries where the metal oxide soil is from a metal oxide additive, the method comprising:

a) applying a use composition to the surface containing the metal oxide soil in a clean-in-place process, the use composition comprising:

i) a pH adjuster in an amount sufficient to provide the use composition with a pH at or below 7;

ii) an anionic surfactant comprising an alkyl alkoxylate phosphate ester, wherein the anionic surfactant is present in an amount sufficient to remove at least about 10% of a metal oxide soil from the surface when the use composition is allowed to contact the surface for at least about 15 minutes at 80° C.; and

iii) a carrier;

b) removing the metal oxide soil from the surface with the use composition; and

c) rinsing the surface to remove the use composition and metal oxide soil.

2. The method of claim 1 , wherein the anionic surfactant is nonyl phenol ethoxylate phosphate ester.

3. The method of claim 1 , wherein the pH adjuster comprises citric acid.

4. The method of claim 1 , wherein the pH adjuster adjusts the pH between about 1 and about 4.

5. The method of claim 1 , wherein the use composition further comprises additional functional ingredients.

6. The method of claim 1 , wherein the anionic surfactant is present in an amount sufficient to remove at least about 60% of the metal oxide soil from the surface.

7. The method of claim 1 , wherein the anionic surfactant is present in an amount sufficient to remove at least about 70% of the metal oxide soil from the surface.

8. The method of claim 5 , wherein the additional functional ingredients are selected from the group consisting of a foam generator, a defoamer, an antifoaming agent, a hydrotrope, a coupler, an enzyme, a chelating agent, a sequestering agent, a threshold inhibiting agent, an antimicrobial agent, a fragrance, a dye, a viscosity modifier, an oxidizer, a reducing agent, a corrosion inhibitor, an anti-etch agent, and mixtures thereof.

9. A method for removing a titanium dioxide soil from a surface where the titanium dioxide soil is from a titanium dioxide additive, the method comprising:

a) applying a first use composition comprising a surfactant to the surface in a clean-in-place process in an amount effective to remove a portion of a soil containing titanium dioxide, and leaving behind a titanium dioxide soil;

b) applying a second use composition to the surface containing the titanium dioxide soil in a clean-in-place process, the second use composition comprising:

i) a pH adjuster in an amount sufficient to provide the second use composition with a pH at or below 7;

ii) an anionic surfactant comprising an alkyl alkoxylate phosphate ester wherein the anionic surfactant is present in an amount sufficient to remove at least about 10% of a titanium dioxide soil from the surface when the second use composition is allowed to contact the surface for at least about 15 minutes at 80° C.; and

iii) a carrier;

c) removing the titanium dioxide soil from the surface with the second use composition; and

d) rinsing the surface to remove the second use composition and titanium dioxide soil.

10. The method of claim 9 , wherein the first use composition is a cleaning composition.

11. The method of claim 9 , wherein the first use composition is a sanitizing composition.

12. The method of claim 9 , wherein the anionic surfactant is nonyl phenol ethoxylate phosphate ester.

13. The method of claim 9 , wherein the pH adjuster comprises citric acid.

14. The method of claim 9 , wherein the pH adjuster adjusts the pH between about 1 and about 4.

15. The method of claim 9 , wherein the second use composition comprises additional functional ingredients.

16. The method of claim 9 , wherein the anionic surfactant is present in an amount sufficient to remove at least about 60% of the metal oxide soil from the surface.

17. The method of claim 15 , wherein the additional functional ingredients are selected from the group consisting of a foam generator, a defoamer, an antifoaming agent, a hydrotrope, a coupler, an enzyme, a chelating agent, a sequestering agent, a threshold inhibiting agent, an antimicrobial agent, a fragrance, a dye, a viscosity modifier, an oxidizer, a reducing agent, a corrosion inhibitor, an anti-etch agent, and mixtures thereof.