(delq ELEMENT LIST)
(setq cell '("value1" "value2" "value3" "value4" "value1" "value2" "value1"))
(delq "value1" cell) #=> ("value1" "value2" "value3" "value4" "value1" "value2" "value1")
(delq ([[car]] cell) cell) #=> ("value2" "value3" "value4" "value1" "value2" "value1")