diff --git a/lib/check/all.sh b/lib/check/all.sh
index f352162..8cf60f0 100644
--- a/lib/check/all.sh
+++ b/lib/check/all.sh
@@ -248,7 +248,7 @@ check_macos_update() {
             spinner_started=true
         fi
 
-        local softwareupdate_timeout="${MO_SOFTWAREUPDATE_TIMEOUT:-10}"
+        local softwareupdate_timeout=10
         if sw_output=$(run_with_timeout "$softwareupdate_timeout" softwareupdate -l --no-scan 2> /dev/null); then
             :
         else
diff --git a/lib/clean/brew.sh b/lib/clean/brew.sh
index eeb69ca..0c3c593 100644
--- a/lib/clean/brew.sh
+++ b/lib/clean/brew.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 # Clean Homebrew caches and remove orphaned dependencies
-# Env: MO_BREW_TIMEOUT, DRY_RUN
+# Env: DRY_RUN
 # Skips if run within 7 days, runs cleanup/autoremove in parallel with 120s timeout
 clean_homebrew() {
     command -v brew > /dev/null 2>&1 || return 0
@@ -44,7 +44,7 @@ clean_homebrew() {
         fi
     fi
     # Run cleanup/autoremove in parallel with timeout guard per command.
-    local timeout_seconds=${MO_BREW_TIMEOUT:-120}
+    local timeout_seconds=120
     local brew_tmp_file autoremove_tmp_file
     local brew_pid autoremove_pid
     local brew_exit=0
diff --git a/lib/clean/project.sh b/lib/clean/project.sh
index d0a1fb3..c5342f3 100644
--- a/lib/clean/project.sh
+++ b/lib/clean/project.sh
@@ -292,8 +292,8 @@ is_protected_purge_artifact() {
 scan_purge_targets() {
     local search_path="$1"
     local output_file="$2"
-    local min_depth="${MOLE_PURGE_MIN_DEPTH:-$PURGE_MIN_DEPTH_DEFAULT}"
-    local max_depth="${MOLE_PURGE_MAX_DEPTH:-$PURGE_MAX_DEPTH_DEFAULT}"
+    local min_depth="$PURGE_MIN_DEPTH_DEFAULT"
+    local max_depth="$PURGE_MAX_DEPTH_DEFAULT"
     if [[ ! "$min_depth" =~ ^[0-9]+$ ]]; then
         min_depth="$PURGE_MIN_DEPTH_DEFAULT"
     fi