An anti-soiling agent compound for preventing pitch contamination in a dry part D of a paper-making process comprising: a low molecular polysiloxane compound for dispersing pitch, represented by the following formula; and a high molecular polysiloxane compound for use in forming a coat film on the dry part, represented by the following formula, wherein the low molecular polysiloxane compound has a kinematic viscosity at 25°C in a range from 10 to 300 mm 2 /s, while the high molecular polysiloxane compound has a kinematic viscosity at 25°C in a range from 40 to 90000 mm 2 /s, and wherein the number of modified groups per low molecular polysiloxane compound is in a range from 0.1 to 3.0, the number of modified groups per high molecular polysiloxane compound is in a range from 1.0 to 10, and the number m of repeating polysiloxane units in the low molecular polysiloxane compound and the number n of repeating polysiloxane units in the high molecular polysiloxane compound have the following relationship: 2 m ≤ n, [in formula, substituent R 1 represents a methyl group or a modified group, with the repeating number m being set to an integer from 20 to 50], and [in formula, substituent R 2 represents a methyl group or a modified group, with the repeating number n representing an integer of less than 1430], wherein the modified group in the low molecular polysiloxane compound is at least one member selected from the group consisting of an amino-modified group, an epoxy-modified group, a polyether-modified group, a carboxyl-modified group and a phenyl-modified group, and wherein the modified group in the high molecular polysiloxane compound is at least one member selected from the group consisting of an amino-modified group, an epoxy-modified group, a polyether-modified group, a carboxyl-modified group and a phenyl-modified group. a low molecular polysiloxane compound for dispersing pitch, represented by the following formula; and a high molecular polysiloxane compound for use in forming a coat film on the dry part, represented by the following formula, wherein the low molecular polysiloxane compound has a kinematic viscosity at 25°C in a range from 10 to 300 mm 2 /s, while the high molecular polysiloxane compound has a kinematic viscosity at 25°C in a range from 40 to 90000 mm 2 /s, and wherein the number of modified groups per low molecular polysiloxane compound is in a range from 0.1 to 3.0, the number of modified groups per high molecular polysiloxane compound is in a range from 1.0 to 10, and the number m of repeating polysiloxane units in the low molecular polysiloxane compound and the number n of repeating polysiloxane units in the high molecular polysiloxane compound have the following relationship: 2 m ≤ n, [in formula, substituent R 1 represents a methyl group or a modified group, with the repeating number m being set to an integer from 20 to 50], and [in formula, substituent R 2 represents a methyl group or a modified group, with the repeating number n representing an integer of less than 1430], wherein the modified group in the low molecular polysiloxane compound is at least one member selected from the group consisting of an amino-modified group, an epoxy-modified group, a polyether-modified group, a carboxyl-modified group and a phenyl-modified group, and wherein the modified group in the high molecular polysiloxane compound is at least one member selected from the group consisting of an amino-modified group, an epoxy-modified group, a polyether-modified group, a carboxyl-modified group and a phenyl-modified group.