The ornamental design for a paintbrushcleaner, as shown and described.
1. Paintbrush cleaner
1.1: Top perspective;
1.2 : Elevation;
1.3 : Elevation;
1.4 : Elevation;
1.5 : Elevation;
1.6 : Top;
1.7 : Bottom;
1.8 : Top perspective;
1.9 : Elevation;
1.10 : Elevation;
1.11 : Elevation;
1.12 : Elevation;
1.13 : Top;
1.14 : Bottom.
The reproductions 1.1-1.7 disclose a paintbrush cleaner in an open configuration, while reproductions 1.8-1.14 disclose the paintbrush cleaner in a closed configuration.
The broken line in the reproductions discloses unclaimed portion of the paintbrush cleaner only and forms no part of the claimed design.