Squeeze the cucumber in several layers of paper towels to remove excess moisture.

Combine cream cheese, mayonnaise, cucumber, dill, and garlic salt and mix together with a hand mixer. Chill until ready to use to allow flavors to blend.

Cut the crust off white bread. Spread cucumber mixture on one slice of bread pretty thick. cover with the other slice of bread. Cut into 4 squares or triangles for small tea sandwiches.