diff --git a/R/clean_names.R b/R/clean_names.R
index c8e50a490..1a8da8563 100644
--- a/R/clean_names.R
+++ b/R/clean_names.R
@@ -171,27 +171,8 @@ clean_names.character <- function(x, include_names = FALSE, ...) {
         } else if (pattern[j] == "scale(poly") {
           i <- trim_ws(unique(sub("^scale\\(poly\\(((\\w|\\.)*).*", "\\1", i)))
         } else if (pattern[j] %in% c("mmc", "mm")) {
-          # # detect mm-pattern
-          # p <- paste0("^", pattern[j], "\\((.*)\\).*")
-          # # extract terms from mm() / mmc() functions
-          # g <- trim_ws(sub(p, "\\1", i))
-          # # split terms, but not if comma inside parentheses
-          # g <- trim_ws(unlist(strsplit(g, ",(?![^()]*\\))", perl = TRUE), use.names = FALSE))
-          # # we might have additional arguments, like scale or weights. handle these here
-          # g <- g[!startsWith(g, "scale")]
-          # # clean weights
-          # gweights <- g[startsWith(g, "weights")]
-          # if (length(gweights)) {
-          #   g <- g[!startsWith(g, "weights")]
-          #   # this regular pattern finds "weights=" or "weights =", possibly followed
-          #   # by "cbind()", e.g. "weights = cbind(w, w)". We extract the variable names,
-          #   # create a formula, so "all.vars()" will only extract variable names if
-          #   # we really have "cbind()" in the weights argument
-          #   g <- c(g, .safe(all.vars(as.formula(paste0("~", trim_ws(gsub("weights\\s?=(.*)", "\\1", "weights = cbind(w, w)"))))))) # nolint
-          # }
-          # multimembership <- as.vector(trim_ws(g))
           if (grepl(paste0("^", pattern[j], "\\((.*)\\).*"), i)) {
-            multimembership <- all.vars(stats::as.formula(paste("~", i)))
+            i <- all.vars(stats::as.formula(paste("~", i)))
           }
         } else if (pattern[j] == "s" && startsWith(i, "s(")) {
           i <- gsub("^s\\(", "", i)
@@ -218,12 +199,8 @@ clean_names.character <- function(x, include_names = FALSE, ...) {
     if (grepl("|", i, fixed = TRUE)) {
       i <- sub("^(.*)\\|(.*)", "\\2", i)
     }
-    # either return regular term, or mm term for brms
-    if (is.null(multimembership)) {
-      trim_ws(i)
-    } else {
-      multimembership
-    }
+
+    trim_ws(i)
   }), use.names = FALSE)
 
   # remove for random intercept only models